Some standard content:
JB/T 9008.4-1999
This standard is a revision of ZBJ80013.4-89 "Test Methods for Electric Wire Rope Hoists". Compared with ZBJ80013.4-89, this standard deletes the special tool for measuring paint film adhesion (Appendix D), and the other main technical contents remain unchanged.
This standard is part of the JB/T9008 "Wire Rope Electric Hoist" series of standards, which includes the following six parts: JB/T 9008.1--1999
Wire Rope Electric Hoist Types and Basic Parameters JB/T 9008. 2—1999
JB/T 9008.3—1999
Technical Conditions for Wire Rope Electric Hoist
Test Methods for Conical Rotor Motors for Wire Rope Electric Hoist
JB/T 9008.4—1999
Wire Rope Electric Hoist
JB/T 9008.5—1999
Wire Rope Electric Hoist
Main Circuit Limiter
JB/T 9008.6—1999
Electric wire rope hoist
This standard replaces ZBJ80013.489 from the date of implementation. Appendix A of this standard is the appendix of the standard.
Technical conditions for acceptance of electrical control equipment
Appendix B, Appendix C and Appendix D of this standard are all indicative appendices. This standard is proposed and managed by the National Technical Committee for Standardization of Hoisting Machinery. The responsible drafting unit of this standard: Tianjin Hoisting Equipment Co., Ltd. The main drafters of this standard: Li Daozhong, Zhou Yaohua, Shi Xuezheng, Lu Xuexi, Cui Zhenyuan, Li Enbo. 222
1 Scope
Machinery Industry Standard of the People's Republic of China
Electric wire rope hoists
Test methods
Electric wire rope hoists-Test proceduresJB/T 9008.4--1999
Replaces ZBJ80013.4-89
This standard specifies the basic test requirements, test categories and test methods for general-purpose electric wire rope hoists. This standard is mainly applicable to general-purpose electric wire rope hoists (hereinafter referred to as electric hoists), and the working level of the mechanism M4 is used as the standard test condition. Other electric hoists for special purposes can also refer to this standard. For inspection and test items not specified in this standard, or when the working level of the electric hoist mechanism is changed according to the design requirements, corresponding inspections and tests should be carried out according to the technical requirements of the tested product. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1032-1985 Test methods for three-phase asynchronous motors GB/T4942.1-1985 Motor housing protection classification GB/T4942.2-1993 Low-voltage electrical enclosure protection grade GB/T5972-1986 Practical specification for inspection and scrapping of wire ropes for lifting machinery GB/T9286-1988 Scratching test for paint and varnish film GB/T10051.2-1988 Technical conditions for lifting hooks and straight handle hooks JB/T9008.2-1999 Technical conditions for wire rope electric hoists JB/T9008.3-1999 Conical rotor motor for wire rope electric hoists JB/T 9008.6—1999
Technical conditions for acceptance of electrical control equipment for electric wire rope hoists 3 Basic requirements for testing
3.1 Requirements for test power supply
The test power supply is three-phase AC, with a rated voltage of 380V and a rated frequency of 50Hz. The sinusoidal distortion rate of the voltage waveform should not exceed 5%, and the difference between the frequency of the test power supply and the rated frequency should be within the range of ±1%. 3.2 Requirements for measuring instruments and measuring tools
The instruments and measuring tools used for testing should be qualified and within the verification period. The selection of its accuracy and range should be able to meet the technical requirements of the measured object. The specific requirements are as follows:
a) The accuracy of the voltmeter shall not be lower than level 0.5; b) The accuracy of the ammeter shall not be lower than level 0.5; c) The accuracy of the three-phase wattmeter shall not be lower than level 1; d) The accuracy of the digital speed meter and slip rate meter shall not be lower than 0.1% ± 1 character; approved by the State Machinery Industry Bureau on June 28, 1999 and implemented on January 1, 2000
JB/T9008.4—1999
e) The accuracy of the torque meter shall not be lower than 1%; f) The accuracy of the dynamometer shall not be lower than level 1.0, g) The allowable deviation of the thermometer shall not be greater than ± 1C; h) The allowable deviation of the base code is ± 0.5%;
i) When selecting the instrument, the measured value should be within the range of 20% to 95% of the instrument range. When measuring three-phase power using the two-wattmeter method, the measured voltage and current values should not be less than 20% of the voltage range and current range of the wattmeter, respectively. 3.3 The test bench should be able to meet the requirements of various measurements and be able to display or automatically record relevant parameters respectively. 3.4 Measurement requirements
3.4.1 During the test, the temperature of the measuring instrument used should be basically consistent with that of the measured object. 3.4.2 The three-phase current is measured using three current transformers and three ammeters, and the three-phase power should be measured using the two-wattmeter method or a special device. 3.4.3 During the test, the readings of each instrument should be read at the same time. When measuring three-phase voltage or current, the average value of the three-phase readings should be taken as the actual measured value.
3.4.4 The sound level meter should be calibrated with a precision sound level meter with an accuracy of 0.5dB before measurement. 3.5 Preparation requirements before the test:
a) According to the test project requirements, check whether the test site and the installation of lines, instruments and various equipment meet the test and related safety requirements;
b) The test work should be carried out by full-time personnel. 4 Test content
4.1 Factory test
4.1.1 General inspection
a) Whether the structural form, power supply, product specifications and models meet the requirements; b) Check the conductivity of the thermal control element;
c) Insulation inspection: Use a 500V megohmmeter to check that the insulation resistance at room temperature should be no less than 1.5MQ; d) Grounding condition: Visually check whether the grounding screw is tightened, whether there is paint and rust on the grounding connection, whether there is a grounding mark, and the grounding resistance value should not be greater than 0.1Q;
e) Check the correctness of the wire rope end fixation and winding: Use a torque hand to check the drum The tightening degree of the screws of the rope pressing plate and the screws related to the fixing of the wire rope, the torque applied depends on the size of the screws [see Appendix C (suggested Appendix); the installation direction of the wedge sleeve, its free end and the force-bearing end must not be installed incorrectly; winding is in accordance with the provisions of the drawings or instructions; f) Check the oil level of the reducer and whether there is oil leakage; g) Hook assembly quality inspection: the hook should be flexible when turned by hand and can be rotated 360° in the horizontal plane; h) Visual inspection of the paint surface quality should be uniform and bright, with consistent color, and no paint leakage, and check whether the markings are complete; i) Whether the junction box and the electronic control device are firmly fixed and the wire layout is correct. 4.1.2 No-load test
At the rated frequency and rated voltage, perform no-load operation on the test bench, lift and lower for no less than 2 cycles, and perform the following tests.
4.1.2.1 Record the voltage and current of each phase.
4.1.2.2 Check the action of the limiter and the phase-shift protection function: push or pull the limiter by hand to make the limiter work and cut off the circuit controlling the lifting or lowering. The hook should be able to stop moving in the corresponding direction immediately, and the movement in the opposite direction can still be carried out; when the limiter is moved forward to a certain position, all circuits in both the positive and negative directions should be cut off, and the hook should not move up or down at this time. 224
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4.1.2.3 Check the assembly quality of the rope guide: first check whether the wire rope wound on the drum is tight, then start the lifting mechanism to lower the hook, the drum rotates 2 circles, and the wire rope should be able to be discharged smoothly from the rope outlet of the rope guide. During the type test, the rope guide should be tested as follows: when the deflection angle of the wire rope and the vertical plane of the drum axis is 3°, the rope guide should be able to work normally when lifting and lowering the rated load. 4.1.2.4 While jogging, visually observe the axial movement of the motor shaft, the value should be between 1 and 2 mm. 4.1.2.5 Determine the no-load noise of the running trolley: Place the electric running trolley on the ground or platform, and run the motor at no load. Measure the noise once at four points on the horizontal plane that are 1m away from the sound source and 90° apart, and take the maximum value. 4.1.3 Rated load test
Carry out the following tests on the test bench under the conditions of rated voltage, rated frequency (except for the voltage reduction test) and rated load.
4.1.3.1 Voltage reduction test
Before the test, adjust the voltage at the motor inlet to 85% of the rated voltage. Start the load in the air 3 times, with a total stroke of about 2m. Then slowly lift it once, for about 1 min.
Note: During the type test, the residual magnetic pull at the rated load and voltage reduction (fast and slow) must also be measured. The test method is shown in JB/T9008.3. 4.1.3.2 Determination of braking slippage
There are two test methods as follows, and the first method should generally be used first: a) Use a steel wire rope with a diameter of about 1mm, with a small bowl tied at one end and the other end connected to a fixed micro switch (contact normally closed). The normally closed contact is connected to the descending circuit controlled by the contactor. The mass of the bowl should be enough to make the switch operate and cut off the descending circuit. When measuring, the small snake is placed on the load (magnetic code). When the load drops to a certain position, the small bowl is separated from the load. At this time, the descending circuit is immediately cut off, and the hook immediately starts to slide down. The vertical distance between the small bowl and the load is the amount of downsliding. Measure three times in a row and take the average value. b) First, mark a certain point (A) of the wire rope wound on the drum. When the mark coincides with a certain point (B) on the shell, immediately release the down button of the flashlight or the corresponding electrical switch to cut off the down circuit. The hook will then begin to slide down. Measure the distance between point (B) and mark (A). This distance divided by the corresponding magnification is the amount of downsliding. Measure three times in a row and take the average value. 4.1.3.3 Second brake function test
When the second brake is provided, first use the first brake (conical brake wheel) to brake the load in the air about 100mm from the ground, and then try to open the first brake to make it lose its braking effect. At this time, the second brake should be able to reliably support the load. The test is performed once, lasting for 30s. No abnormal phenomenon occurs during the test.
4.1.3.4 Determination of lifting speed
When the lifting distance exceeds 0.5m, use a stopwatch to measure the lifting distance within 10s; or take a fixed distance, measure the required time, calculate the lifting speed, measure 4 times in a row, and take the average value. 4.1.3.5 Determination of the noise of the lifting mechanism
Install the electric hoist on the test bench. When measuring, the maximum outer corridor size of the whole machine is used as the calculation starting point line for the distance measurement, and the measuring points are arranged on a parallel line extending 1m outward from the starting point, as shown in Figure 1. When the motor and reducer of the lifting mechanism are located at the same end of the reel device, the measuring points are 1, 2, 3, 4, 5, 9 and 10 as shown in Figure 1, a total of seven points. If the motor and reducer are arranged at both ends of the drum, the measuring points are 1, 2, 3, 6, 7, 8, 9 and 11, a total of eight points. The measuring points should be no less than 1m away from the reflective surface (wall, column, machine tool, etc.) and other objects, and no less than 2m away from the corner.
When measuring, use a sound level meter to measure the background noise at each measuring point according to the A-level reading, and then measure the noise of the whole machine. During the test, the pulse sound beep value is excluded. When the difference between the measured value and the background noise is in the range of 4 to 9dB (A), the test value should be corrected. The correction value k is shown in Table 1. The actual noise value of the lifting mechanism is the measured noise value minus the correction value 1. 225
The difference between the measured noise and the background noise
JB/T 9008. 4-1999
9~～6
4.1.3.6 Record the current and voltage (power should also be recorded during type test). 4.1.4 Dynamic load test
Under the conditions of rated voltage, rated frequency and test load of 1.25 times of rated load, conduct 5 reciprocating lifting tests on the test bench, and the aerial lifting shall not be less than 3 times, each stroke is about 2m at fast speed, and each operation is about 1min at slow speed. Note: For electric hoists equipped with overload limiters, they should be disabled before testing. 4.1.5 Overload limiter function test
Test according to the requirements of 3.3.5 in JB/T9008.2-1999. 4.2 Type test
In addition to the factory test items, the following items should be tested for the electric hoist complete machine test items. 4.2.1--General inspection
a) Measure the overall dimensions: Measure the length, width and height dimensions according to the product drawings. b) Measure the lifting height: measure the distance between the upper limit position and the lower limit position of the hook (i.e. the lifting height). If the test bench is limited by the height, you can also count the number of wire rope circles n on the drum exposed outside the rope guide when the hook is in the upper limit position, and calculate the lifting height according to formula (1):
Where: H…-lifting height, m;
Drum rope groove bottom diameter. mm;
d—-wire rope diameter, mm;
Pulley ratio.
4.2.2 Static load test
r(D。+d)n
1000×a
The electric hoist is loaded slowly and steadily on the test bench until it reaches 1.5 times the rated load. The lifting load is 100~226
200 mm from the ground, and the suspension time shall not be less than 10 minutes. JB/T9008.4-1999
After unloading, visually inspect all parts and ensure that there are no cracks, permanent deformation, paint peeling, damage, loose joints, or other abnormalities. When equipped with a running trolley, the trolley can also be tested separately. Place the running trolley to be tested on a fixed track and load (the weight of the fixed electric hoist should be added when loading) and inspect according to the requirements of 3.2.9 of JB/T9008.2-1999. 4.2.3 Dynamic load test
Continuously operate according to the test conditions specified in 4.1.4 and the following cycle period (see Appendix B (suggested appendix) for not less than 1 hour.
For electric hoists with running trolleys, the round-trip running test time of the trolley should not be less than 10 minutes. a) When the lifting speed of the electric hoist is single speed, its cycle period is 30 s, and the operation mode is as follows: lifting (6s) - stop (9s) - lowering (6s) - stop (9s) (starting in the air each time); b) When the lifting speed of the electric hoist is double speed, its cycle period is 30s, and the operation mode is as follows: slow lifting (3s) - stop (3s) - fast lifting (6s) - stop (3s) - fast lowering (6s) - stop (3s) - slow lowering (3s) - stop (3s) (starting in the air each time). After the functional test of each mechanism is completed, it should be visually inspected. All parts should not be damaged, the connections should not be loose, and there are no other abnormal phenomena. 4.2.4 Running trolley test
4.2.4.1 Determine the running speed
The test is carried out on the track under the conditions of rated voltage, rated frequency and rated load. The track should be flat, and the static deflection of the track mid-span should be less than L/1000 (L—the spacing of the support points of the track). During the test, two points on the track that are not less than 2m apart are marked. When the trolley runs normally to the mark, the timing starts, and when it runs to the other mark, the timing stops. Repeat 4 times, calculate the speed respectively, and take the average value. 4.2.4.2 Running trolley climbing test
Under the conditions of rated voltage, rated frequency and rated load, the running trolley travels back and forth 3 times on a track with a slope of 1/200, and each one-way stroke is at least 2m, and it should work normally. If the test is conducted on a horizontal track, a force should be applied in the opposite direction of the operation, and its magnitude should be equal to 1/200 of the sum of the hoist mass and the rated load.
4.2.5 Lifting and running motor test
Carry out in accordance with the relevant provisions of JB/T9008.3. 4.2.6 The residual magnetic pull of the motor under reduced voltage conditions shall be measured in accordance with the relevant provisions of JB/T9008.3. 4.2.7 Motor temperature rise test
4.2.7.1 The test shall be carried out under the conditions of rated voltage, rated frequency and rated load, and the temperature rise value shall be measured after the temperature rise of the lifting motor is stable.
The test shall be carried out according to the cycle period specified in 4.2.3. In order to shorten the test time, it can be continuously lifted and lowered at the beginning, which lasts about 20 minutes. When the temperature of the motor rises to a certain value (cannot reach the allowable temperature), the test shall be carried out according to the specified cycle until the temperature no longer rises, and the temperature rise value shall be measured. The test method shall be carried out in accordance with the relevant provisions of Chapter 8 of GB/T1032-1985. 4.2.7.2 The temperature rise test of the running motor using the inertia wheel method is carried out in accordance with the relevant provisions of Chapter 8 of GB/T1032-1985. The test cycle is calculated based on the motor's load duration (FC) and the equivalent number of starts per hour [see Appendix D (suggestive Appendix)]. The calculation method of the equivalent load (inertia wheel) is shown in Appendix A (Standard Appendix).
Note: When testing and appraising new products, the temperature rise of the lifting motor should be measured at various working levels of the mechanism, and the temperature rise of the running motor should be measured at various load duration (FC). 4.2.8 Measure the starting time and braking time of the hoisting motor. The hoisting mechanism starts from the beginning to normal operation, and starts braking after normal operation until it stops. Use instruments to record the starting and braking time. 227
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4.2.9 Inspection of the control box, button device and limiter shall be inspected in accordance with the relevant provisions of JB/T9008.6. 4.2.10 Inspection of protection level
Inspect in accordance with the requirements of GB/T4942.1 and GB/T4942.2. 4.2.11 Appearance coating quality
4.2.11.1 Paint film thickness
Measure with a paint film thickness gauge.
4.2.11.2 Paint film adhesion
Select 10 places on the painted surface of the electric hoist and use a special tool to perform a grid test. When scribing, the blade should be perpendicular to the surface to be measured, and the force should be evenly applied. After scribing, use a soft brush to gently brush the surface in the diagonal direction for 3 times in both the forward and reverse directions. A small amount of flakes of the coating is allowed to peel off at the intersection of the cuts in each cutting area, and the peeling area shall not exceed 5%. The surface appearance is shown in Figure 2. Figure 2
For details of the special cutter for scribing test, please refer to the provisions of GB/T9286. 4.2.12 Inspection of main parts
4.2.12.1 Wire rope
The quality of the wire rope shall comply with the provisions of 3.5.2 of JB/T9008.2-1999, and it can be exempted from inspection if there is a certificate of conformity. The certificate of conformity must contain the following contents:
Nominal diameter, structure, tensile strength, twisting direction and type, theoretical calculated breaking force and minimum breaking force, standard number of the product, etc.
4.2.12.2 Hook
Inspect and test according to the relevant provisions of GB/T10051.2. 4.2.12.3 Manufacturing accuracy of gear pair of lifting reducer Use special instruments to detect four gear accuracy indicators: pitch cumulative error △F, pitch deviation △Fr. Tooth shape error △fi, tooth direction error △F. For gears whose final process is grinding, the base pitch deviation A/b should be checked. Measure the center distance deviation of the reducer housing cover according to the corresponding accuracy requirements. 4.2.13 Inspection of oil leakage and internal debris of lifting reducer After the type test is completed, first check for oil leakage, then disassemble the reducer and use cleaning fluid (such as gasoline) to clean the inner wall and internal parts of the housing, filter the cleaning fluid of the reducer with a 200-mesh copper mesh, remove the oil stains with xylene, bake the debris at a temperature of 120-135C for 1h, cool for 20-30min, and then weigh the mass of the debris with a balance. 4.3 Life test
4.3.1 Hoisting mechanism test
The test should be carried out on a dedicated test bench. The test bench should be able to automatically change the operating cycle and record the number of starts and operating time. The load should never fall to the ground during the test.
4.3.1.1 The rated load of the hoisting mechanism is applied at the rated voltage and rated frequency according to the nominal load spectrum coefficient km-1.00. When the hoisting mechanism is in single-speed operation, a periodic operation test of 800 hours shall be carried out; when the hoisting mechanism has the function of dual-speed operation, a periodic operation test of 1200 hours shall be carried out. The operation mode is as follows:
When the hoisting mechanism is in single-speed operation, one cycle period is 30s, which is divided into two starts, namely: hoisting (6s) → stopping (9s) → lowering (6s) → stopping (9s) 228
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When the hoisting mechanism is in dual-speed operation, one cycle period is 305, which is divided into two starts, namely: slow raising (3s) → stopping (3s) → fast raising (6s) → stopping (3s) - fast lowering (6s) —Stop (3s) → Slow down (3s) → Stop (3s) 4.3.1.2 During the test, normal maintenance shall be carried out according to the requirements of the instruction manual, and the following items shall be done: a) After running for 1h, 50h, 200h, 400h and 800h, test and record the noise and braking slippage respectively; b) The oil should be changed after running for 50h; c) After running for 200h, 400h, 600h and 800h, dismantle the motor and reducer respectively, and check the following items: —Motor air gap, stator and rotor scratches; —Motor and reducer sealing condition;
Brake ring, bearing, gear, rope guide, etc.; Mechanical overload limiter switch wear; Wire rope wear, wire breakage standard at scrapping see GB/T5972. The wire rope that has reached the scrap standard can still continue to be tested, but the life time and corresponding cumulative bending times of the wire rope should be recorded until any of the strands are completely broken (the wire rope must be replaced at this time).
Note: The above test time refers to the single-speed electric hoist. If it is a double-speed, the time will be increased by 50%. 4.3.1.3 During the entire test process, no parts except the wire rope shall be replaced. After the test, the lifting mechanism should continue to work normally under the rated load, the noise shall not exceed 90dB (A), the sealing parts shall not leak oil, and the overload limiter can still work normally. 4.3.2 Impact test of lifting motor and reducer combination 4.3.2.1 Assemble the lifting motor and reducer into one, under no-load, according to the load duration FC=80%, the number of starts is 480 times/h, and the operation is 1 million times. During the test, the electric control equipment equipped with the electric hoist shall be used for control. The operation mode is as follows: right turn (6s) → stop (1.5s) → left turn (6s) → stop (1.5s) Note: For dual-speed motors, only the fast operation test is carried out, and the operation mode and requirements are the same as above. 4.3.2.2 Check and record the following items during the test: a) When the axial movement of the motor shaft reaches 4mm, make the first adjustment; b) The wear of electrical components and machinery in the electronic control equipment; c) The temperature rise of the motor, the gap between the rotor and the stator; d) The wear of the bearings;
e) The function of the shaft seal;
f) The fatigue and wear of the brake pressure spring and the disc spring; g) The lubrication and sealing of the reducer.
Normal maintenance of the electronic control equipment is allowed during the test. After the test, all parts should be able to continue to be used. 4.3.2.3 The electrical components of the electronic control equipment should comply with the provisions of JB/T9008.6. 4.3.3 Running motor impact test
4.3.3.1 Install an inertia wheel on the motor shaft (see Appendix A for calculation method) and perform 200,000 tests according to the cycle of 4.2.7.2; the electric control equipment provided by the electric hoist shall be used during the test. 4.3.3.2 Check and record the following items during the running test: that is, the contents of items b) to g) in 4.3.2.2.
Normal maintenance of the electric control equipment is allowed during the test. After the test, all parts can continue to be used, and the wear of the brake ring should not exceed 1.5mm.
JB/T9008.4-1999bzxz.net
Appendix A
(Appendix to the standard)
Calculation of the inertia wheel during the impact test and temperature rise test of the running motor A1 The rotational inertia of the inertia wheel is calculated by formula (A1): Where: - moment of inertia, kg·m2;
G. Rated lifting capacity, kg
J= 0. 75(G,+G)
4 yuan (Lan)*g
G——mass of the electric hoist (including the running trolley), kg: n——motor speed, r/min;
operating speed, m/min;
acceleration of gravity.m/s (g9.81).
A2In general, first determine the diameter of the inertia wheel, and then calculate the thickness of the inertia wheel according to formula (A2): 21g
In the formula: B-
Inertia wheel thickness, m;
Inertia wheel radius. m;
-Density, kg/m\.
Appendix B
(Suggested Appendix)
Example of calculation of test cycle
B1The duty cycle of a single-speed motor is FC=40%, and the equivalent number of starts is 240 times/h. The motor starts twice for each cycle. Test cycle:
T=2×#
X3 600=30(s)
Each power-on time:
Operation mode:
XTXFC=6(s)
Rise (left) (6s) → stop (9s) → fall (right) (6s) → stop (9s) The operation cycle is shown in Figure B1.
(A1)
(A2)
JB/T9008.4-1999
2The duty cycle of the two-speed motor is FC=40%/20%, and the equivalent number of starts is (240 times/240 times)/h. B2
For each operation cycle, the stator winding of each speed is started twice. Test cycle:
Each power-on time t:
Fast:
Slow:
Operation mode:
X3600=30(s)
XTxFC=6(s)
XTXFC=3(s)
Slow rise (3s)-stop (3s)Fast rise (6s)→stop (3s)-→fast drop (6s)→stop (3s)-slow drop (3s)-stop (3s)The operation cycle is shown in Figure B2.
H/m
See Table C1 for tightening torque of screws or bolts
Nominal diameter of screws and bolts
JB/T 9008.4-1999
Appendix C
(Suggestive Appendix)
Tightening torque of screws or bolts
Maximum allowable tightening torque
Performance level
Performance level of nuts
Screws, bolts
Nominal diameter
JB/T9008.4—1999
Table C1 (end)
Maximum allowable torque
Energy level
Appendix D
(Suggestive Appendix)
Performance level of nuts
Load duration rate, equivalent number of starts per hour and load conversion for different working levels of mechanisms The load duration rate and equivalent number of starts per hour for different working levels of mechanisms are shown in Table D1. Table D1
Duty cycle of hoisting motor FC
Working level of mechanism
For the same model, the load conversion of different working levels of mechanism is shown in Table D2. D2
Working level of mechanism
Equivalent number of starts
Rated lifting weight
G8=0.8G,7
G,7=0.8G,6
G.6=0.8G.5
G,5=0. 8Gn4
G.4=0. 8G.3
Note: G. in the table indicates the rated lifting weight when the working level of the lifting mechanism is M3, and the same applies to the following. Double
480/480
420/420
360/360
300/300
240/240
180/180
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